linux-kernel - Re: [PATCH 1/2] clk: qcom: gcc-sm6375: Update the .pwrsts for usb gdsc

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Message-ID: <e04a406045121aa31762cacc02b2300d.sboyd@kernel.org>
Date:   Mon, 06 Mar 2023 11:35:55 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>, agross@...nel.org,
        andersson@...nel.org, linux-arm-msm@...r.kernel.org
Cc:     marijn.suijten@...ainline.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] clk: qcom: gcc-sm6375: Update the .pwrsts for usb gdsc

Quoting Konrad Dybcio (2023-03-02 18:29:11)
> The USB controller on sm6375 doesn't retain its state when the system
> goes into low power state and the GDSCs are turned off.
> 
> This can be observed by the USB connection not coming back alive after
> putting the device into suspend, essentially breaking USB.
> 
> Fix this by updating the .pwrsts for the USB GDSCs so they only
> transition to retention state in low power.

Is this a temporary fix? Is that why there isn't a Fixes tag? If it's a
workaround then please add a TODO comment indicating the USB driver
doesn't work properly.